Abstract

We have already reported orangish yellow phosphors, and applied them to fabricate warm white light-emitting diodes(LEDs). In this letter, we report on greenish yellow phosphors, and use them to create daylight when coupled to an blue LED chip . The newly discovered phosphors emit at shorter wavelengths of under the excitation, and exhibit a smaller Stokes shift than does. By using this short-wavelength yellow oxynitride phosphor, bright daylight emissions from white LEDs can be generated. Thus, highly efficient white LEDs with tunable white light can be fabricated with phosphors, enabling them for a wider range of applications.